package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {
    @Autowired
    private ShoppingCartService shoppingCartService;

   /* *//**
     * 模拟购物车
     * @return
     *//*
    @GetMapping("list")
    public R<List> list(){
        return R.success(new ArrayList());
    }*/

    /**
     * 添加购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){

        //A. 获取当前登录用户，为购物车对象赋值
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setId(currentId);
        //B. 根据当前登录用户ID 及 本次添加的菜品ID/套餐ID，查询购物车数据是否存在
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);

        Long dishId = shoppingCart.getDishId();
        if (dishId != null){
            //添加的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else{
            //添加的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }

        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        if (cartServiceOne != null){
            //C. 如果已经存在，就在原来数量基础上加1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.save(cartServiceOne);

        }else {
            //D. 如果不存在，则添加到购物车，数量默认就是1
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return R.success(cartServiceOne);
    }

    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByDesc(ShoppingCart::getCreateTime);

        List<ShoppingCart> list = shoppingCartService.list();
        return R.success(list);
    }

    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("clean")
    public R<String> clean(){
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        shoppingCartService.remove(queryWrapper);
        return R.success("清空购物车成功");
    }
}
